Griftan AC-12 Coarse Thread Acetylene Cylinder Safety Cap

Keep Your Shop Safe and Compliant

Every professional welder knows that an acetylene cylinder is the heart of the oxy-fuel setup, but it can also be a significant hazard if not treated with respect. The valve on top of that tank is the most vulnerable point, and if it shears off, you are looking at a very bad day. That is why the Griftan AC-12 Low Pressure Safety Collar is a non-negotiable piece of gear for your shop. Designed specifically for acetylene tanks with coarse threads, this cap screws on tight to create a steel armor around your valve, ensuring that a simple tip-over doesn't turn into a disaster.

We know that in the real world, tanks get dragged, bumped, and jostled in the back of trucks. The AC-12 is built to take that abuse so your equipment doesn't have to. It fits the standard 3-1/2 inch collar perfectly, provided you have the coarse thread version (check your tank—if it's not fine thread, this is likely the one you need). Once installed, it gives you the peace of mind that your cylinder is road-ready and safe to store. It’s a small investment that protects your expensive gas, your regulator connection points, and most importantly, you and your crew.

Beyond physical safety, using the AC-12 keeps the safety inspectors off your back. OSHA and DOT regulations are strict about cylinder transport: if the regulator is off, the cap must be on. Showing up to a job site with uncapped cylinders is a guaranteed way to get fined or kicked off the site. The Griftan AC-12 makes compliance easy. It’s rugged, easy to spin on and off, and clearly shows that you take safety standards seriously. It’s the mark of a professional operation.

Don't rely on flimsy plastic caps or mismatched threads that strip out. The Griftan AC-12 is heavy-duty hardware for heavy-duty work. Whether you are running a fabrication shop, a mobile welding rig, or a large construction project, make sure your acetylene cylinders are capped with the right gear. If you are running coarse thread tanks, the AC-12 is the only cap you should trust to get your gas from point A to point B safely.